Re: [Qemu-devel] qemu/hw usb-uhci.c

[Lonnie Mendez]

address@hidden wrote:

> Hello Fabrice,
>
> This patch introduces an already fixed bug with linux guest os. The
> message is: "controller still running". The attached patch fixes this
> problem.
>  
  To expand on this, I saw windows checking the status register several 
times to look for hchalt once R/S bit was written 0.  However, Linux 
guest hcd only checks the status register once before giving up.  So the 
much simpler patch here works in both cases.  However, it also means we 
can't properly indicate when the frame has really stopped and the host 
controller halted.  This isn't something that shows up with the code in 
CVS because the hub is always attached and thus the linux hcd doesn't 
try to suspend the bus (Windows XP will do this and there is a patch 
I'll try to submit later on this week - very busy).